Test grading machine



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1. IN A SYSTEM FOR INDICATING WHETHER A CONDUCTING MARK SELECTIVELY LOCATED IN ONE OF A PLURALITY OF AREAS ON A SHEET BEING EXAMINED COINCIDES WITH A CONDUCTING MARK LOCATED IN ONE OF A PLURALITY OF AREAS ON A MASTER INDICATOR, COMPRISING A VOLTAGE SOURCE OF ONE POLARITY RELATIVE TO A REFERENCE POTENTIAL, A VOLTAGE SOURCE OF ANOTHER POLARITY RELATIVE TO SAID REFERENCE POTENTIAL, AN ENERGY STORING REACTANCE, MEANS FOR SELECTIVELY ESTABLISHING CONDUCTING PATHS THROUGH THE AREAS ON SAID SHEET AND SAID INDICATOR FROM SAID SOURCES TO SAID REACTANCE, THE SELECTED PATH APPLYING A VOLTAGE OF SAID FIRST POLARITY TO SAID REACTANCE WHEN THE POSITIONS OF THE CONDUCTING MARKS COINCIDE AND APPLYING A VOLTAGE OF SAID SECOND POLARITY TO SAID REACTANCE WHEN THE POSITIONS OF THE CONDUCTING MARKS DO NOT COINCIDE, MEANS FOR DISCHARGING SAID REACTANCE ONLY AFTER THE CONDUCTING PATH THROUGH THE MARK ON THE MASTER IS EXTINGUISHED, AND MEANS FOR SENSING THE DISCHARGE FROM THE REACTANCE. 